For a safe and reliable download, always prioritize official Apple sources:
High Sierra’s Safari added "Intelligent Tracking Prevention" to block advertisers and an option to stop videos from auto-playing. Pros & Cons Macos High Sierra 10.13.6 Raw Download
For those without access to a Mac who need a raw file to flash to a USB drive on Windows, Olarila is a popular community resource. : They provide For a safe and reliable download, always prioritize
If you already have a version of High Sierra installed and just need the update files, Apple provides standalone packages: 0;16; Do not download macOS from random blogspots or torrent sites
Because the official route is broken for most users, the community relies on trusted mirrors and archives. Do not download macOS from random blogspots or torrent sites. A "RAW download" from a bad source can contain rootkits, keyloggers, or ransomware.
A: macOS is free software. Downloading a RAW installer for personal use on Apple hardware is generally considered acceptable, provided you don’t redistribute it for profit. However, using unofficial patchers violates Apple's EULA (but no one has ever been sued for it).